Spark-plug.



"Witnesaeq J. A. SAVAGE.

SPARK PLUG.

APPLICATION FILE-D FEB. 13. I918.

1 ,286,123. Patented Nov. 26, 1918.

JAZJ'm/aya,

JOSEPH A. SAVAGE, OF NEW HAVEN, CONNECTICUT.

SPARK-PLUG.

Specification of Letters Patent.

Patented Nov. 26, 1918.

Application filed February 1918. Serial No. 216.910.

To all whom it may concern:

Be it known that I, JOSEPH A. SAVAGE, a citizen of the United States,residing at New Haven, in the county of New Haven and State ofConnecticut, have invented new and useful Improvements in Spark-Plugs,of .which the following is a specification.

This invention relates to'spark plugs for use in conjunction withinternal combustion engines, and the main object of the invention is toproduce a spark plug which may be used also as a priming device for thecylinder of such an engine, the plug embodying a novel construction, andrelative arrangements of parts whereby the desired object may beobtained with accuracy and cortainty. 1

A further object is to produce a plug. the construction of whichwillenable the priming liquid or carbon removing liquid to be conducted tothe spark terminals of the power and ground electrodes with the purposeof cleaning the same and rendering them free from carbon. lubricatingoil or other adhering material.

With the above and other objects in view, the invention consists in thenovel construction, combination and arrangement of parts, as hereindescribed, illustrated and claimed.

In the accompanying drawings.

Figure 1 is a side elevation of the plug complete.

Fig. 2 is a similar view of the core of the plug and the partstheretoattached. omitting the outer shell.

Fig. 3 is a central longitudinal section through the core. showing thetubular power electrode and the parts attached thereto.

Fig. 4 is a detail view of the power elec-- trode and its attachedparts. the same being partlv broken away in section to illustrate itstubular formation.

The improved plug resembles in appearonce. the spark plug now in commonusc.the same comprising the metallic body or shell 1 having a reducedand threaded lower portion 2 adapted to screw in a corresponding openingin connection .with which the plug is.

used. The plug also comprises the core 3 which extends through the shell1 and is secured in fixed relation by a clamping nut 4. One or moreelectrodes 5 mar be employed and a single power electrode 6.

In carrying out the present inwntion. the power electrode 6 is oftubular formation for the greater part of its length. the bore orpassage 7 of said electrode being open at the upper outer end andterminating short of the inner or spark end of the electrode where it isintersected by a lateral outlet passage or port 8. The upper end portionof the power electrode 6 is threaded as shown the rounded extremity 13of the core and 1.

forms a fluid tight joint to prevent loss of compression in the cylinderwith which the plug is associated. The electrode 6 is also formedadjacent. to the cup 12 with a key or feather 14 which is received in aguideway or internal groove 15 in the bore of the core. This preventsthe electrode 6 from turning within the core butadmits of a longitudinalmovement of said electrode in the core.

The operation of the plug is as follows. The outer or upper priming cup10 is first partly unscrewed from the power electrode 6 and then saidcup and electrode are pressed downwardly until the outlet port 8 isexposed beyond the inner end of the core 3. Priming or other liquidintroduced in the cup 10 will now flow through the power electrode intothe inner cup 12 and will overflow said cup into the cylinder. When theouter cup 10 is screwed tightly down against the cap nut 11. the innercup 12 is pressed tightly against the adiacent and correspondinglyshaped end of the core 3 thcrebv expressing all the remaining liquidtherefrom. The same operation is resorted to when using a carbonremoving liquid for the purpose of softening and loosening any carbon orother matter which adheres to the sparking terminals of the electrodes.

16 designates a tubular bushing which extends through the bore of theplug and fits tightly therein. Said bushing extends entirely through thecore and the upper end thereof is threaded to receive the member 10.

Said bushing is further formed with a slot through which the feather 15projects. The

bushing 16 not only makes the core comlain or core from cracking if thecup 10 also having an outlet port which inter note the bore of theelectrode and is adapted to 10 be dispowd beyond the inner end of thecore 1 j by partly unscrewing said priming cup and "He 0} this! patentmty obtained for five cents each, by addressing the Commissionerpressing the latter toward the core, and a second cup on said electrodebeyond the inner end of thevcore and adapted to receive the contents ofsaid electrode,- the adjacent end of the core being shaped to fill thesecond named cup and express the contents therefrom.

In testimony whereof I affix my signature.

JOSEPH SAVAGE.

of ratentn Washington, D. 6.

